Measuring-pump



W. T. HATNIAKER.

MEASURNG PUMP.

APPLICATION F|LED1uLY19,192o.

1,378,029. Patented May 17,1921.

2 SHEETS-SHEET I.

7- fnf.. 25'

f WILLIAM T.

HATMAKEB OF DAYTON, OHIO, ASSIGNOR IO THE PBOTECTO PUMP COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

' MEAsUnING-PUMP. l

To all 'whom t may concern.'

Be it known that I, WILLIAM T. HAI'- MAKER, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in- Measuring-Pumps, of which the following is a speciication, reference being had there- ,in to the accompanying drawing.

-freversing mechanism comprising a movable part which can be shifted from one position to another to cause the` continued for ward movement of the operating member to l move the piston in opposite directions. Suitable automatic means are provided for controlling the movement of the movable memberso that it will be shifted at the proper time.

The object of the presentinvention is toVA provide a simple and efficient mechanism for controlling the shifting of the movable memberof connecting mechanism.

A further object of the invention is to provide such a mechanism in which the movable member will be positively heldagainst shifting movement until the piston has completed a predetermined movement, thereby preventing the short stroking of the piston and insuring the delivery of a full measure of liquid to the customer.

Other objects of the invention will appear as the mechanism is described in detail.

In the accompanying drawings Figure l is a view of a portion of a liquid measuring pump, partially broken away to show the operating mechanism in front elevation; and Fig. 2 is a similar view, partially broken away to showthe operating mechanism in side elevation.

In these drawings I have illustrated one embodiment of 'my -invention and have shown the same as applied to a double cyl- Specication of Letters Patent. Patented Digby. 17, 1921;` Application led July 19, 1920. Serial No. 397,491. l

indery pump, the pistons of which are operatedby an operating member having operative movement in a forward direction only and which lis connected with the 4two pistons through suitable gearing'comprising a pmion movable from one position to another to reverse the direction of the move-` ment imparted to the pistons by the for- .ward movement of the operating member.

This movable member, or pinion, is shifted by means otra spring actuated device, the spring of which is placed under tension as the pistons approach ,the limits of their movement in one direction and which is held positively against operation until the pistons have completed theiry movements, at which time ,the springactuated deviceis released and permitted to-operate, under the iniuence of the spring which has been conpressed, to shift the pinion, thereby reversing the-direction ofthe movement of the -pistons without reversing the direction of movement of the operating member.l The mechanism for accomplishing this result may take various forms and it will be understood that that here shown has been chosen for the purpose of illustration only.

In that form of the mechanism illustrated in the present drawings, the'pumping devices comprise two cylinders, the heads of which are shown at 1 and 2 and both of which are connected with a common discharge pipe 3, which, in the arrangement here shown, extends upwardly to a point above the operating mechanism. Mounted in the respective cylinders are pistons, not shown, provided with piston rods 4 and 5, extending upwardly through the cylinder vheads and having at their upper ends toothed portions 6 and 7 constituting rack bars which mesh with a driving'gear 8 carried byA a shaftf9. The-two rack bars are arranged on the opposite sides of the gear 8 so that the movement of this vgear, in one direction will move the piston vof one cylinlder in a directiontov discharge the liquid therefrom and will move the piston of the other cylinder in the y,opposite direction to permit the cylinderto be again filled with liquid above the piston. Obviously, the

. movement of the gear in the opposite direction will reverse the direction of movement of the pistons and will cause the first mentioned piston to be moved downwardly, or

in a filling direction, and thelast mentioned piston to be moved upwardly, or 1n a discharge direction.

' any suitable character; butl which is here Movement is imparted' to the gear 8,l which Iconstitutes a part of the pumping devices,

by an operating member Whichmay beof ratchet mechanism, the ratchetwheel of` such a mechanism being shown' at 12 in sets o f gearing and apinion connected with Fig. 2. Interposed between the operating member, or crank,10, and the gear 8 of the pumping device is suitable connecting mechanism which, as here shown, comprises two the operating device and movable into operative relation with either train of gearing. As here shown, the pinion, 13, is slidably mounted on the shaft 1-1 and is held against rotation relatively thereto, preferably by splining it to the shaft. `When the pinion 13 is at the limit of its movement in one direction it will mesh directly with a gear 14 mounted for rotation about the axis of the shaft 9 and rigidly secured to the gear 8 so that any movement imparted to the gear 14 will be transmitted in the same direction to the gear` 8. lVhen the pinion 13 is shifted to the opposite limit of its movement it will be brought into mesh with an intermediate, oridle, gear, 15, which is connected directly with the gear 8. In thepresent instance, becal se of the arrangement of the parts, the gear 15 has rigidly secured thereto, and forming in effect a partthereof, a second gear 16 which meshes with the gear 8. 1t will be apparent, however, that the gears 15 -and 16 form ineffect-a single intermediate gear through which the movement of the pinion 13. is transmitted to the gear 8 in a direction opposite that imparted to the gear 8 through the gear 14.v

The several gears and the operating member may be supported in any suitable manner but in the particular arrangement here illustrated a supporting frame 17 is carried by standards,or upright rods, 18 and has rigidly secured thereto depending brackets 19 in which the shafts 9 and 11 are j'ournaled. This frame is here shown in the form of a plate and also serves to support the other parts of the mechanism to be hereinafter described.

prises a lever, or yoke, 20 pivotally mounted on a shaft 2.1 carried by the frame member 17 and having its arms connected at their free ends-with a grooved collar '22 rigidly secured to the pinion 13. Rigidly connected with the yoke 2O is an arm` 23 the free end of'which is connected with a collar 24slidably mounted on a rod 25 and constituting a movable stop. Mountedron the rod 25 on opposite sides of the movable stop 24 are springs 26 and 27 which are confined respectively between the movable stop 24 and fixed stops 28 and 29 mounted on the rod 25 `above and below thev movable stop 24.

Longitudinal'movement is'imparted to the 'forms a part of atrecording mechanism and forms no part of the present invention, the pinsbeing mounted on this cam merely as a convenient "method of connecting them withj the gear8. The pins are so arranged that as the gear 8 approaches the limit of its movement. in one ldirection the pin 32 will engage the arm 30 and impart downward -movement to the rod 25 and as the gear 8 approaches the limit of its movement in the opposite direction the pin 31 will engage the arm 30 and impart upward movement to the rod 25. During the movement of the rod25 in one direction or the other as the rod 25 the .collar 24 is held in a fixed position so that the rod will move relatively thereto, thereby causing" one or the other of the springs 26 and 27 to be compressed, this depending upon thedirection of movement Y lof the rod 25.

In the construction here shown, an arm 34y is mounted on the shaft 21 and rigidly connected with the yoke 2() and the arm 23, and c'operating with this arm 34 is a pivoted dog, or stop, 35 carried by a shaft 36 mounted in suitable brackets carried by the frame member 17. The nose of the dog 35. and the end of the arm 34 are so arranged that when the pinion 13 is in one position the dog will engage the upper edge of the arm 34, as shown in Fig. 2. and

when the pinion is in its other position the nose of the dog will engage the lowe-redge of the arm 34, and in either instance the arm 34 and the parts connected therewith, including th'e pinion.r are held positivelyv against movement. Means are provided for moving the dog 35 into an inoperative posi- 'tion and releasing the arm 34 of the spring actuated device so that the latter can impart movementy to the pinion, and this means is controlled by the pumping devices in such a manner that the dog will be moved into its inoperative position at the instant that the pistonwhich is moving in a direction to discharge the liquid from its cylinder .has reached a predetermined position, that is, a

position in which it will have discharged -a' f-ullvj-measure of liquid 'from' the cylinder. As here shown, I have slidably mounted in the frame member lttwo vertically movable rods, or plungers, 37 and 38, the' upper endsv of which are arranged to actuate a trip arm 39 rigidly secured with the dog 35. In the present instance, the trip arm-39 comprises two members which are spaced apart and which havemounted therein a rod 40, the end portions of which lie in the paths, respectively, of the plungers 37 and 38.' These plungers are arranged adjacent` V`to the' ment. The'plungers are preferably adjustable so that the tripping of the dog may be properly timedand to'v this end the lower, or contact, portions thereof are inthe form of screws 43 threaded into the lower ends of the bodies of the plungers and flocked in their adjusted positions by-nuts 44.v

The operation of the device will be readily understood from the foregoing description of the several parts thereof and it will be apparent that the parts in the positions shown in the drawings, upward movement is being imparted forward movement of the crank. The dog 35 is in engagement with the upper edge of the arm 34 of the spring actuated device i and the movement of the gear 8 is being transmitted to the rod 25 in a downward direction so as to place the upper vspring 26 under tension. .The piston rod 5 has not quite completed its movement but a slight further movement of the same in an upward direction will cause the lug 42 thereon to engage the plunger 38 and trip the dog 35, thereby releasing the spring actuated device and permittingthe spring which has been compressed to expand and shift the pinion out of engagement with the gear 14 andinto v engagement with the intermediate gear 15, 'thereby causing the gear 8 to be moved in a reverse direction by the continued forward movement of the crank 10. If the spring actuated device has sufficient power to force the pinion 13 out of mesh with lits gear while pressure is being applied to the operating member, the spring will 'be so heavy as to be objectionable and I therefore prefer to use a relatively light spring and to relieve the pressure on the operating member at the end of each stroke, it being apparent to the piston rod 5 by the that the forward movement of the operating member will be checked by the contact of the lug 42 with the plunger 38. No rearward movement is imparted to the operating member but by relieving the pressure thereon the frictional contact between the pinion and that gear with which -it is in mesh is so reduced that the relatively light spring which li employ isenabiea to shia the,

pinion. If the teeth of the pinionare not in line with tlie spaces between the teeth of the gear toward which it is moved the first forward movement of zthe operating member will bring the same into line and the'p'iniu will slip into 4mesh with its gear.

This movement of the pinion also moves the arm 34 of the spring actuated device-into a vposition above' the level of the nose of the dog 3 5 and as soon as downward movement has been imparted to the piston rrod 5,' the dog will move by gravity into a position to engage the lower' edge of the arm 34thus` locking-the spring actuated device against further movement until the dog 35 is trippedA l by the upward movement of the otherupisvton rod, 4. In this manner it will bel apparent not only thatI have provideda very "simple and efficient mechanism 'for automatically reversing the movement of the pistons without reversing the direction of movement of the operating member, 'but that this mechanism is of such a character that the-mechanism cannot be reversed until the pistons have completed their movements and a full measure of liquid has been discharged from the one cylinder, and the .other cylinder'v has been again filled with liquid.

\Whi le I have shown and described one embodiment of my invention I wish it to be understood .that Ido not desiret'o be limited to thev details thereof 'asivarious modifications may occur to a persniskilled inthe art. -i

Having'n'ow fully described.A my invention, what I claim as new-and-desire to secureby Letters Patent, is

1L In a mechanism of the character described, a pumping device, an operating' member therefor, a reversible connection' between said operating vmember and said pumping device comprising a movable member, a j Ispring actuated device to shift said movable member, means controlled by said pumping device to place the spring of said spring actuated device under tension, and`means to prevent'the movement of said'movable member by said spring actuated device until said pumping device has completed a y predeterminedmovement. 2. Ina mechanism 'of the character 'described, a pumping device, an Yoperating member therefor,` a reversible connection between said operating member and said pumping device comprising a movable member, a spring actuated device to shift said movable member, means controlled by said pumping device to place the spring of said spring actuated device under tension, a locking device to hold said spring actuated device against movement, and means to render saidl locking device inoperative when said pumping device has completed a predetermined movement.

3. ln a mechanism of the character delo scribed, a pumping device comprising a gear, an operating member, connecting mechanism interposed between said operating member and said gear and comprising a part movable' from one position to another i5 to cause said gear to be moved in opposite directions by the movement of said operatn ing member in one direction, a spring act-uated device to shift said movable part,means actuated by said gear to place the spring of 2o said spring actuated device under tension,

and means controlled by said pumping Vdevice to hold said spring actuated device against movementuntilsaid gear has completed its movement in one direction.

4. In a mechanism of the character described, a. pumping device, an operating member therefor, a reversible connection between said operating member and said pumping device comprising a movable membei', means -for actuating said movable member comprising a part adapted to. be connected with said operating-mechanism for movement thereby in opposite directions, lsprings connected with said member of said actuating device, a. movable stop to be engaged by one ot' said springs to cause the lat# ter to 'be compressed when the movable member of said actuating means is moved in one direction, and means to hold said 40 movable stop against movement until said pumping device has completed its movement in one direction and to then release the same to permit said actuating means to shift said movable member. i

5. In a mechanism of the character described, a pumping device, an operating member therefor., a reversible connection between said operating member and. said pumping device comprising a movable mem ber, a rod adapted to be connected with said pumping device and to be moved in opposite directions thereby, fixed stops mounted -on said rod, a movable stop interposed between said fixed stops, springs arranged between said movable stop and the respective fixed stops, an operative connection between said movable stop and said movable member of said reversible connection, and-means to" hold said movable` stop against movement Se until said pumping device has completed a predetermined movement and to then release said stop. 1

6. In a mechanism of the character described, a pumping device comprising a gear, an operating member, connecting and means actuated by said pumping mechanism interposed between said operating memberiand said gear and comprising a part movable from one position to another to cause said gear to be moved in opposite directions by the movement of said operating member in one direction, a rod mounted for longitudinal movement, means for cansing movement to be imparted to said rod in one direction when said gear is roated in one direction and for causing movement to be imparted to said rod in the opposite direction when said gear movesin the opposite direction,'fixed stops mounted on said rod, a movable stop interposed between said fixed stops, springs mounted on said rod between said movable stop and the respecy tive fixed stops, an operative connection between said movable stop and said movable member, and means controlled by said pumping device yfor holding said movable stop against movement until said gear has completed its movementV in one direction and to then release said stop.

7 In a mechanism of the character describedl a. pumping device comprising a gear, an operating member, connecting mechanism interposed between said operating member and said gear and' comprising a part movable from1 one position -to another to ycause said gear to be moved in opposite directions by the movement of said operating member in one direction, a rod mounted for longitudinal movement, means for causing movement tobe imparted to said rod inone direction when said gear is rotated in one direction and for causing move- .ment to be imparted to said rod in the opposite direction when said gear moves in the opposite direction, fixed stops mounted i on said rod, a movable stop interposed between said fixed stop, springs mounted on said rod between said movable'stops and the respective fixed stops, a bell crank lever having its respective arms connected with said movable stop yand with said movable member, an arm connected with said bell crank lever, a4 dog to engage said arm to hold the saine normally against movement,

device t-o release said arm and to permit the movement of said stop when said gear has completed a'predetermined movement.

8. In a mechanism of the character de@ scribed, a pumping device comprising a gear, an operating member, connecting mechanism interposed between said operating member and said gear and comprising a part movable from one position to another to cause said gear to be moved in opposite directions by the movement ot4 said operating member in one direction, a rod mounted for longitudinal movement, means tor causing movement to be imparted to said rod in one direction when said gear' is rotated in one direction and for causing 1,378,029 v f. ,Y

movement to be imparted to saidrod in the opposite direction when said gear .moves in the' opposite direction, fixed stops mounted on said rod, a movable stop interposed between said fixed stops, springs mounted on said rod between said movablel stop and the respective fixed-stops, a bell crank lever having Aits respective arms connected with said movable stop and with said movable member, an arm connected with said bell crank lever, a dog adapted -to engage one side of said arm when said movable member is inone position and to engage the other* side of said arm when saidjmovable member is inits other position, and means actuated by said pumping device to move said dog into an inoperative position.

9. In a mechanism of the character de'- scribed, ga, pumping device, an operating member therefor, a reversible connection between said operating member and said pumping device comprising a movable member, a lever for shifting said movable member from one position to another, springs to move said lever in opposite directions, means actuated by said pumping devices to cause one or the other of said springs to be placed under tension, .and meansto hold said lever against operative movement until said pumping device has completed a predetermined movement and to then release said lever and permit the same tobt actu- 'ated by that spring which has'been placed under tension.

10. In a mechanism of the character described, the combination with pumping cylinders, piston rodsifor said cylinders having toothed portions, a, gear meshing with the respective toothed portions of said rods to move the latter simultaneously in opposite directions, and an operating member Yfor said gear, of a reversible connecting mechanism between said operating member and said gear comprising a movable pinion, a spring actuated device for shifting said pinion from one position to another, a detent to bold said spring actuating device normally against movement, and means controlled by the movements of said 'piston rods to actuate said detent and release said spring' actuated device.

11. In a mechanism of the characterd'e-I scribed, the combination lwith pumping cylinders, piston rods for said cylinders having toothed portions, a gear meshing With'the .respective toothed portions of said rods to move the latter simultaneously in opposite directions and an operating member for said gear, of a reversible connecting mechanism between said operating member and said gear comprising a movable pinion, a spring actuated device for shifting said'4 pinion from one position to another, and comprising a lever connected with said pinion, a holding device acting on said lever when said pinion is in either position to.`

directions, andan operating member for said gear, of a reversible connecting mechanism between said operating member and said gear comprising a movable pinion, a spring'a'ctuated device for shifting said pinion from one position to another, and-comprising a lever connected with said pinion, a holding device acting on said lever when said pinion is in either position to hold said lever against movement, tripping devices -or said detent movably mounted adjacent to the respective piston rods, and means carried by said piston rods 4for actuating the respective tripping devices to move said holding device into an inoperative position;

13. In a mechanism of thecharacter described, the combination with pumping cylinders, piston -rods for said cylinders having,

said gear, of a reversible connecting mechani'sm between sa1d operating member and said gear comprising a movable pinion, a

spring actuated device for shifting said pinion from one position to another, and comprising a lever connected with said pinion, an arm connected with said lever, a movable dog arranged to engage said arm to hold said lever in either of its two positions, tripping devices slidably mounted adjacent to the respective piston rods and each arranged to move said dog into an inoperative posiand parts carried by said piston rods to engage the respective tripping devices and actuate said dog. f

' 14. In a -mechanism of the character described, the combination with pumping cylinders, piston rods for said cylinders having toothed portions, p respective toothed portions of said rods 'to move the latter'simultaneously in opposite directions, and an operating member for said gear, of a reversible connecting mechanisrn between said operating member and said gear comprising a movable pinion, a

spring actuated device for shifting said pinion from one position to another, and comprising a bell crankV lever having one arm connected with said pinion, a rod mounted for longitudinal movement, means actuated by said gear t'or moving directions according to the direction of a gear meshing with the,

said rod in opposite movement of said gear, fixed stops mounted on said rod, a collar slidably mounted on said rod between said Xed stops and connected with the other arm ofsaid bell crankI lever, springs coiled about said rod between said collar and the respective 'fixed stops, an arm connected with said bell crank lever, a

detent pvotally 4mounted adjacent to saidv arm and having anose arranged to enga e one side of said arm when said p1n1on 1s 1n one position and to engage the other slde of said arm when said pinion is in the oppoi-- -site position, tripping devices movably' mounted adjacent to saiddetent, said detent having a part connected therewith and lying 15 in the paths of both tripping, devices, and lugs carried by the respective pistonrods and arranged i to actuate said tripping devices. l

In testimony whereof, I alx my signature 20 hereto.

WILLIAM T. HATMAKER. 

